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Soil water content-water activity relations of structured kaolinitic specimens from GAB equation

Rao, SM and Rekapalli, M (2020) Soil water content-water activity relations of structured kaolinitic specimens from GAB equation. In: Geotechnique, 70 (10). pp. 863-866.

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Official URL: https://dx.doi.org/10.1680/jgeot.18.P.181


The GAB (Guggenheim-Anderson-de Boer) equation is explored to describe the relation between equilibrium soil water content (wequil) and water activity (relative humidity) of structured kaolinitic soils along the drying path. The equation is chosen as it has the advantage of a theoretical basis and can describe sorption behaviour of soils over a wide range of water activities. The GAB parameters evaluated from desorption experiments with de-structured specimens were successful in predicting the equilibrium water contents of structured kaolinitic specimens along the drying path. Insight into the influence of water activity on moisture desorption from structured soil specimens is obtained from energy requirements to desorb water molecules and by estimating the relative affinity (distribution constant) of water molecules for retention in soil pores or to undergo desorption. © 2019

Item Type: Journal Article
Publication: Geotechnique
Publisher: ICE Publishing
Additional Information: The copyright of this article belongs to ICE Publishing
Keywords: Desorption; Molecules; Soil moisture, Distribution constant; Energy requirements; Equilibrium water contents; Influence of water; Kaolinitic soils; Moisture desorption; Soil water content; Structured soil, Soil pollution, desorption; equation; kaolinite; porosity; relative humidity; residual soil; retention; soil water; sorption; suction; water content
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 28 Jan 2021 05:33
Last Modified: 28 Jan 2021 05:33
URI: http://eprints.iisc.ac.in/id/eprint/67377

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